HOSE AS 3N7268 - Caterpillar

Required Tools
Illustration 1 g03630357
Tooling (A) 198-4240 Digital Pressure Indicator Gp
Table 3
Tool Item Qty Part No Description
A 198-4240 Digital Pressure Indicator Gp
A1 1 198-4234 Digital Indicator
A2 1 198-4237 Pressure Sensor Gp
(0 to 3,445 kPa (0 to 500 psi))
A2 1 198-4238(1) Pressure Sensor Gp
(0 to 34,450 kPa (0 to 5,000 psi))
A2 1 198-4239 Pressure Sensor Gp
(0 to 41,368 kPa (0 to 6,000 psi))
A2 1 251-9600(2) Pressure Sensor Gp
(0 to 68,900 kPa (0 to 10,000 psi))
A3 1 198-4236 Adapter Cable As
(1) This sensor must be purchased separately. The sensor is not included in the 198-4240 Digital Pressure Indicator Gp
(2) This sensor can only be used on large diameter pressure taps like 6V-3965 Fitting.Test Preparation
Refer to Testing and Adjusting, "Machine Preparation for Troubleshooting".Refer to Testing and Adjusting, "System Pressure Release".
Illustration 2 g03630356
Steering Frame Lock in the LOCKED Position
Move steering frame lock to the LOCKED position.
Prepare the machine for testing by completing the procedure that is specified in the Service Manual module Testing and Adjusting, "Machine Preparation for Troubleshooting" for the machine that is being serviced.Test Procedure
Load sense pressure can be checked in the same way as implement discharge pressure. Checking the load sense pressure will provide an accurate reading of the pressure signal that is being sent to the implement pump. The implement discharge pressure should be equal to the load sense pressure plus the added margin pressure. Theoretically, adding the pump margin to the load sense pressure reading should yield the discharge pressure. However, machine level interactions cause inaccuracies in these readings.
Illustration 3 g06268032
Location of implement pump discharge pressure tap. Right side of machine in the articulated hitch.
(1) Implement pump discharge pressure tap.
Attach a pressure gauge that can sustain pressures up to 34450 kPa (5000 psi) to the implement pump discharge pressure tap (1).
Start the machine.
Turn off the Ride Control for the machine.
Increase the engine speed to high idle.
The pressure reading at tap (1) before stall should be 20680 700 kPa (3000 100 psi)
Stall the third function lever in the forward position. The pressure should read 22200 700 kPa (3220 100 psi).
Stall the third function lever in the rearward position. The pressure should read 22200 700 kPa (3220 100 psi).
Stall the fourth function toggle switch in the forward position. The pressure should read 22200 700 kPa (3220 100 psi).
Stall the fourth function toggle switch in the rearward position. The pressure should read 22200 700 kPa (3220 100 psi)
If the pressures are correct, turn off the machine, release the pressure to the hydraulics to disconnect the pressure gauge. See the next section if adjustments are needed.Adjustment Procedure
Illustration 4 g03638556
Auxiliary valve located in the front of the machine.
(2) Locknut
(3) Third function auxiliary pressure limiter
(4) Forth function auxiliary pressure limiter
Turn off machine.
Locate the auxiliary valve. The best way to access the valve is up through the front of the machine with the lift arms and secure. Locate the auxiliary pressure limiter that